<template>
<div class="row">
  <div v-for="column in columnList" :key="column.id" class="col-4 mb-4">
    <div class="card-body text-center">
      <img :src="column.avatar" :alt="column.title" class="rounded-circle border border-light w-25 my-3">
      <h5 class="card-title">{{column.title}}</h5>
      <p class="card-text text-left">{{column.description}}</p>
      <a href="#" class="btn btn-outline-primary">进入专栏</a>
    </div>
  </div>
</div>
</template>

<script lang="ts">
import { computed, defineComponent, PropType } from 'vue'
export interface ColumnProps {
  id: number;
  title: string;
  avatar?: string;
  description: string;
}
export default defineComponent({
  name: 'ColumnList',
  props: {
    list: {
      type: Array as PropType<ColumnProps[]>,
      required: true
    }
  },
  setup(props) {
    const columnList = computed(() => {
      return props.list.map(column => {
        if(!column.avatar) {
          column.avatar = '../assets/logo.png'
        }
        return column
      })
    })
    return {
      columnList
    }
  }
})
</script>

<style scoped>

</style>
